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John James Hammond
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Individual
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Publication of GB189902798ApublicationCriticalpatent/GB189902798A/en
2798. Hammond, J. J. Feb. 8. Roofing-tiles.-The tiles are made with ogee lap joints a, flat under surfaces, and upper ribs c. The flat lower edges of the tiles overlap, and rest on the ribs c of the tiles below, and the sides are supported by the ribs a'. The tiles may be made of earthenware, cement, or concrete.